Tanks
One scale per liquid across every boat: a tank twice the height holds twice as much.
First 36 SE
Fuel18 galWater53 galX4.0
Fuel48 galWater65 gal
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Beneteau First 36 SEvsX-Yachts X4.0
X4.0 is the heaviest at 17,857 lb, 84% more than First 36 SE.
Anyone with the link sees this comparison.
Key differences
Worked out from the published figures below — arithmetic, not opinion.
- X4.0 is the heaviest at 17,857 lb, 84% more than First 36 SE.
At a glance
Dark icons are the standard layout; faded ones are what the larger layout adds.
Beneteau
First 36 SE
Sailing Monohull
- Length
- 39.3 ft
- Beam
- 12.5 ft
- Draft
- 6.4 ft
Length : beam 3.2 : 1
Cabins3Headsnot publishedBerthsnot publishedX-Yachts
X4.0
Sailing Monohull
- Length
- 39.7 ft
- Beam
- 12.5 ft
- Draft
- 7.9 ft
Length : beam 3.2 : 1
Cabins2–3Headsnot publishedBerthsnot published
Length : beam is length divided by beam — the higher it is, the slimmer the hull. Multihulls read low by nature.
A figure marked with a quote mark was read from the builder's page. Open it for the exact line, the page and the date.
| Model |  Beneteau First 36 SE |  X-Yachts X4.0 |
|---|---|---|
| Overview | ||
| Brand | Beneteau | X-Yachts |
| Model | First 36 SE | X4.0 |
| Generation | Unknown | Unknown |
| Hull type | Sailing Monohull | Sailing Monohull |
| Propulsion | Sail | Sail |
| Production status | Announced | In production |
| Production start year | Unknown | Unknown |
| Production end year | Unknown | Unknown |
| Designer | Lorenzo Argento; Sito (interior) | X-Yachts Design Team |
| Dimensions | ||
| LOA | 39.3 ft | 39.7 ft |
| Hull length | Unknown | 37.7 ft |
| Beam | 12.5 ft | 12.5 ft |
| Draft | 6.4 ft | 6.9 ft–7.9 ft |
| Displacement | 9,700 lb | 17,857 lb |
| Accommodation | ||
| Cabins | 3 | 2–3 |
| Heads | Unknown | Unknown |
| Berths | Unknown | Unknown |
| Performance & Rig | ||
| Main sail | Unknown | Unknown |
| Jib | Unknown | Unknown |
| Genoa | Unknown | Unknown |
| Upwind sail area | Unknown | Unknown |
| Downwind sail area | Unknown | Unknown |
| Engine power | 29 hp | 40 hp |
| Engine count | 1 | 1 |
| Materials | ||
| Hull material | Fully cored, vacuum-infused composite | GRP epoxy infusion |
| Deck material | Unknown | Unknown |
| Mast material | Unknown | Unknown |
| Keel type | Unknown | T keel with lead bulb (shallow or deep draft option) |
| Rudder type | Unknown | Unknown |
| Sources | Figures read fromwww.beneteau.com/en-us/first-se/first-36-se· Specificationsread 9/20/2026 7 of 9 figures here carry the builder's own words |
10 of 11 figures here carry the builder's own words |
Size, to scale
Each boat's published length and beam seen from above, and its mast height and draft from the side, all drawn on one scale.
Outlines are schematic; the dimensions are the builder's.
Drawings side by side
Each boat's layouts, profiles and sail plans as its builder published them. Step through each column to line up the drawings you want to compare.
First 36 SE
1 / 2Profilee first 36 se no sail — Beneteau
No drawings collected yet for X4.0.
Speed, power & tanks
What the builders publish about how fast, how strong and how far — each figure on one scale for every boat.
How they sail, in numbers
Classic yacht-design ratios worked out from each builder's published figures. They compare boats; they don't grade them.
Sail area / displacement
How much sail the boat carries for its weight — its power in light air.
- First 36 SEnot published: sail area
- X4.0not published: sail area
How it is worked out
sail area (ft²) ÷ (displacement as ft³ of seawater)^⅔
Displacement / length
How heavy the boat is for its waterline length. Lower is lighter and quicker; higher is steadier and roomier.
- First 36 SEnot published: waterline length
- X4.0201· Moderate
How it is worked out
displacement (long tons) ÷ (0.01 × waterline length in ft)³
Ballast ratio
The share of the weight carried in the keel — a rough guide to stiffness, though how deep that weight sits matters as much.
- First 36 SEnot published: ballast
- X4.038· Moderate
How it is worked out
ballast ÷ displacement × 100
Comfort ratio
Ted Brewer's measure of how gently a boat moves in a seaway. Higher means a slower, easier motion.
- First 36 SEnot published: waterline length
- X4.026.5· Coastal
How it is worked out
displacement (lb) ÷ (0.65 × (0.7 × LWL + 0.3 × LOA) × beam^1.333), lengths in ft
Capsize screening
A guide from the inquiry after the 1979 Fastnet race: below 2 was taken as suited to ocean passages. It ignores hull shape and where the ballast sits.
- First 36 SE2.34· 2 and above
- X4.01.91· Below 2
How it is worked out
beam (ft) ÷ (displacement as ft³ of seawater)^⅓
Hull speed
Roughly the speed a displacement hull reaches before it has to climb its own bow wave.
- First 36 SEnot published: waterline length
- X4.07.8 kn
How it is worked out
1.34 × √(waterline length in ft), in knots
Most builders publish a light displacement. The ratios were defined on a loaded boat, so every boat here reads a little lighter than a surveyor's figure would — all alike, which keeps them comparable.
Worth adding to this comparison
The boats most like the ones above, by hull form, size and use.
Beneteau
First 36Sailing Monohull · 36 ft
X-Yachts
XR 41 SportSailing Monohull · 47.8 ft
X-Yachts
XR 41 RaceSailing Monohull · 47.8 ft
Elan
E5Sailing Monohull · 39.2 ft